<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>border属性</title>
    <style>
        #one {
            border-color: black;
            /* 顺序为上、右、下、左 */
            border-width: 10px;
            border-style: solid;

            /* 控制单边边框 */
            border-top-width: 10px;
            border-right-width: 5px;
            border-bottom-width: 20px;
            border-left-width: 15px;
        }
    </style>
</head>
<body>
    <div id="one">我是111</div>
    <div>我是222</div>
    <div>我是333</div>

    <ul>
        <li>aaa</li>
        <li>bbb</li>
        <li>ccc</li>
    </ul>
    <ol>
        <li>eee</li>
        <li>fff</li>
        <li>fff</li>
    </ol>
</body>
</html>